Analog Devices Inc. AD8250ARMZ

Overview

AD8250ARMZ from Analog Devices is a digitally programmable gain instrumentation amplifier (PGIA) with GΩ input impedance, 10 MHz bandwidth, 20 V/μs slew rate, and selectable gains of 1, 2, 5, and 10 - designed for high-precision sensor signal conditioning in data acquisition systems interfacing with fast ADCs.

For engineers reviewing the AD8250ARMZ datasheet, AD8250ARMZ pinout, AD8250ARMZ application, or AD8250ARMZ equivalent, key selection criteria include guaranteed CMRR ≥98 dB at G=10, 615 ns settling to 0.001%, low 1.7 μV/°C offset drift, and MSOP-10 package compatibility with space-constrained industrial and biomedical front-ends.

Technical Context

The AD8250ARMZ implements a classic 3-op-amp instrumentation topology on Analog Devices' iCMOS® process, enabling precision DC performance while supporting high-speed operation. Its internal laser-trimmed resistor array ensures <0.03% gain error at G=1 and maintains ≥80 dB CMRR up to 50 kHz across all gains.

Dual gain-setting modes - transparent (direct logic-level control via A0/A1) and latched (edge-triggered via WR) - provide flexibility for microcontroller-driven or shared-bus system architectures. Gain switching time is 325 ns, with full output settling added separately per gain step.

Key Specifications

Pinout & Package

AD8250ARMZ is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.5 mm pitch), optimized for thermal performance and high-frequency CMRR via symmetrical analog routing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable gain instrumentation amplifier applications.

Compared with AD8251ARMZ and LTC6915IMS8#PBF, the AD8250ARMZ uniquely balances dual-supply operation, G = 1/2/5/10 flexibility, 10 MHz bandwidth, and guaranteed 80 dB CMRR to 50 kHz - making it optimal for industrial DAQ and precision biomedical designs requiring both DC accuracy and AC fidelity.

Availability

AD8250ARMZ is available at Aetrix Electronics and suitable for data acquisition, biomedical analysis, and test and measurement applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD8250ARMZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8250ARMZ belongs to Analog Devices' precision instrumentation amplifier product line, engineered for high-accuracy, high-speed sensor signal conditioning in demanding industrial and medical instrumentation.

FAQ

What gain settings does the AD8250ARMZ support?

The AD8250ARMZ supports four discrete, digitally programmable gains: 1, 2, 5, and 10. These are selected via two logic inputs (A0 and A1) using either transparent mode (gain changes immediately with A0/A1 voltage) or latched mode (gain updates on the falling edge of the WR signal). The AD8250ARMZ does not support continuous or interpolated gain values.

How does the AD8250ARMZ achieve high CMRR over frequency?

The AD8250ARMZ achieves ≥80 dB CMRR to 50 kHz through a combination of symmetrical pin layout, balanced internal amplifier design, and iCMOS® process-matched resistors. Its pinout minimizes parasitic capacitance imbalance between +IN and −IN, and laser trimming ensures initial resistor matching better than 0.03% - critical for maintaining CMRR at higher frequencies where layout asymmetry dominates.

Can the AD8250ARMZ operate from a single supply?

No, the AD8250ARMZ requires dual supplies: ±5 V to ±15 V. It is not specified for single-supply operation. The input common-mode range extends to within 1.5 V of each rail, and output swing reaches ±13.5 V with ±15 V supplies. Attempting single-supply use violates absolute maximum ratings and invalidates all AC/DC specifications.

What is the purpose of the REF pin on the AD8250ARMZ?

The REF pin on the AD8250ARMZ sets the output common-mode voltage level. When driven with a stable DC voltage (e.g., midsupply or ADC reference), it offsets the output accordingly - enabling level-shifting for single-ended ADC inputs or differential signaling. The REF input has 20 kΩ input resistance and accepts voltages from −VS to +VS, with gain from REF to OUT of 1 ± 0.0001 V/V.

Does the AD8250ARMZ require external gain-setting resistors?

No, the AD8250ARMZ integrates all precision gain-setting resistors internally. Its programmable gains (1, 2, 5, 10) are implemented via laser-trimmed, on-chip resistor arrays switched by the digital A0/A1/WR interface. No external resistors are needed - simplifying layout, eliminating matching errors, and ensuring guaranteed gain accuracy and temperature stability.